The cover photos you see in My Moments are automatically selected and organized by the Narrative Cloud Service, displaying the most interesting photos captured. Once inside the moment view, you can select a new cover photo that you think better represents your moment.
To change your moment's cover photo, slide to the photo you want your cover photo to be and tap on the image icon. Your Moment's cover photo will now have been changed.
Moment cover photos are now represented as three photos instead of one. This will give your memories more contextual value when browsing your My Moments feed. We essentially felt that it’s hard to portray a moment or memory with just one photo. A meaningful moment can be what ever you choose it to be. Therefore, this solution places emphasis on more flexibility so that you're better able to find the meaning and value of your moment.